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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996d58428335862f77b146a1debe012b9e47b32ee5210e9fb5e40224b2112ce9' 
  AND token = 'FEVYlXpaKZ7Q0ZaljkzFzexmgm7XYrtirtDL0lKXTnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}